Fuel Pump Check Procedure

1. Reduce the internal pressure of the fuel pipes and hoses by the following procedures.

^ Disconnect the fuel pump harness connector at the rear of the fuel tank.

^ Start the engine and run until the fuel supply stops and the engine stops. After it stops by itself, turn the ignition switch to the OFF position.

Disconnect the negative battery (-) terminal.

Connect the Fuel Pump Harness connector.





2. Remove the upper banjo bolt while holding the fuel filter nut securely. Remove the bolt from the hose connection.

Note:
Do not discard the two copper washers found on the banjo fitting as they are needed while using the fuel adapter in step three.

CAUTION:
Cover the hose connection with a shop towel to prevent splashing of fuel caused by residual pressure in the fuel line.





3. Using the Fuel Pressure Gauge Adapter (09353-24000, 09353-24200), install the Fuel-Pressure Gauge to the Fuel Filter. Tighten the bolt to the specified torque.

TIGHTENING TORQUE

Fuel pressure adapter to fuel filter: 18-25 lb.ft.

4. Connect the battery negative (-) terminal.





5. Apply battery voltage to the terminal for the pump drive and activate the fuel pump. Then, with fuel pressure applied, check that there is no fuel leakage from the pressure gauge or connections.





6. Start the vehicle, disconnect the vacuum hose at the pressure regulator and plug the hose end. The fuel pressure at idle with the vacuum hose disconnected should be 46-49 psi.





7. Measure the fuel pressure with the vacuum hose connected to the pressure regulator at idle. The fuel pressure at idle with the vacuum hose connected should be 39 psi.





8. If the results of the measurements made in steps (6) and (7) are not within the standard value, use the following table to determine the probable cause, and make the necessary repairs.





9. Stop the engine and check for a change in the fuel pressure reading. The fuel pressure should hold for approximately 5 minutes. If the fuel pressure drops more than 5 psi, use the table to determine the cause.





10. Loosen and remove the fuel pressure adapter bolt while holding the fuel filter nut securely.

CAUTION
Cover the hose connection with a shop towel to prevent splashing of fuel caused by residual pressure in the fuel line.

11. Install the two new copper washers (P/N 17512-12000).

Note:
Do not reuse the two copper washers found on the banjo fitting as new ones are needed while reinstalling the banjo bolt.

12. Connect the fuel hose to the fuel filter, and tighten the bolt to the specified torque.

TIGHTENING TORQUE:
Fuel line banjo bolt to fuel filter: 18-25 lb.ft





13. Apply battery voltage to the fuel pump drive terminal to operate the fuel pump and check for any fuel system leaks.

14. After finishing service procedures, proceed to the underhood labeling instructions.